T and territory possession interact to activate courtship song and behavior.
T but not territory possession altered patterns of mRNA expression in the mPOA.
T increased steroid hormone-related mRNA AR and ARO in the mPOA.
T increased mRNA of opioid-related genes MOR and PENK in the mPOA.
T decreased mRNA of dopaminergic-relate gene TH mRNA in the mPOA.